Which of these does your vehicle have ?
The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel.
The NVG 236 transfer case features a 4 button shift control switch located on the instrument panel.
Do you know what DTC'S - diagnostic trouble codes are ? Both of these 4X4 systems can set DTC'S , Having a professional or factory scanner is what is needed to check for these codes . Not a OBD 2 code reader or autozone , advance etc... The four button system can set a bunch of them .
DTC B2725
DTC C0300
DTC C0305
DTC C0308
DTC C0309
DTC C0310
DTC C0315
DTC C0323
DTC C0324
DTC C0327
DTC C0362
DTC C0367
DTC C0374
DTC C0376
DTC C0387
DTC C0550
DTC C0611
The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.
The NVG 233 transfer case provides the driver with 3 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
Any of these mode/gear positions may be selected while driving the vehicle. However, the transfer case will not allow a shift into, or out of, 4LO unless the following criteria has been met:
• The engine is running.
• The automatic transmission is in Neutral, or the clutch pedal is applied on manual transmissions.
• The vehicle speed is below 5 km/h (3 mph).
Finding out what if any codes are stored should be your first step .
SOURCE: 1994 chevy s10 blazer 4x4 push button type
small sylinoid on the top of the transfer case needs replaced. easy to do. it has three vacumelines going to it just trun out and replace like a bolt.
SOURCE: 94 s10 blazer wont go out of four wheel drive
The electric shift solennoid on the transfer case is probably bad,common problem with these.
SOURCE: 1998 Chevy Blazer 4x4, $ wheel drive won't work (both 4hi & 4lo )
Reset the computer by disconnecting the battery. This should solve this. nutetral is for the four lo only to engage.
Mike
SOURCE: 2004 Blazer won't shift into four wheel drive. I
ok what i would try is put the truck in park then try to **** into your 4wheel drive high or low, other than that with the computer thats on board you may just have a technical issue that can be solved at the dealership
SOURCE: 1997 chevy Blazer ZR2 4x4 not engaging
Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.
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